[Christ]

Something I wonder about is depth of the lights compared to the diffuser. I don't think that the diodes can be touching, but they shouldn't be too far away, either. Since the diffuser is effectively a lens, there is an optimum depth of light source where the beam will converge at a specific distance.

I feel like we need to give thought to lamp depth, shape, and diffusion angle (in the case of LED's, because they're narrow-band diffusers, but can be made wider/more narrow)